Question

How many grams of water will be needed to produce 1.5 moles of acetylene gas?

Answer 1

See discussion.

Explanation:

You can't get acetylene gas from water, but you can get it from the action of water on calcium carbide:

`{C-=C}^(2-)Ca^(2+) + H_2O(l) rarr H-C-=C-H(g)uarr + Ca(OH)_2(aq)`

Such a reaction was the basis of an early miners' lamp. If you need `1.5*mol` acetylene you need `1.5*mol` water, i.e. a mass of `27` `g`.